As I went to leave work today, I could hear water leaking into the level 2 car park. This is not unusual as when it rains heavily (and it had, for some days) quite a few of the pipes leak and a bit of water ends up on the ground.
However, this sounded like a fair bit of water. When I traced the water to its source I was... somewhat bemused.
I also did not investigate what might be going on below, on level *3*.